I was playing Minecraft (1.14.4) as usual on my MacBook Air. I had the launcher set to "Keep Open While Playing" so that I could relaunch it if it ever crashes. The launcher had said that it would update next time I opened it.
The game and the launcher both suddenly crashed. I clicked it to reopen it. A window popped up saying it was updating. I waited. The progress bar didn't fully fill, but the launcher opened up and it was just a black screen.
I restarted my computer. Open Minecraft Launcher, black screen again. I restarted several more times, same problem.
I emptied the contents of my Minecraft game, deleted Minecraft, and downloaded it again from Minecraft.net.
I opened the file. Same window saying it was updating. Progress bar doesn't fully fill again, launcher opens again, black screen again.
I tried that a few more times, same problem.
Please help.
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You can get to it by following https://help.mojang.com/customer/portal/articles/1480874-where-are-minecraft-files-stored-
Might this be related to MCL-12084? Different operating systems and launcher versions, but those screen shots look the same.
I don't think it is. This was caused by corrupted launcher files on macOS. That one was caused by a broken display drivers on Windows 10.
In any case, we need to harden the launcher against this sort of issue, detect the problem, and force a re-check of the files when the UI does not start properly.
If you rename or move
~/Library/Application Support/minecraft/launcher, does it help?